Heh I've been looking for some kind of "preview button" myself for quite a long time

There's one more thing you should know. If your game will be finally visible in Play Store (Alpha or Beta) there is this section on the bottom called "Additional information"[attachment=0:1glx5elv][/attachment:1glx5elv]

Don't worry about that yet, it will only show some default stuff (Current Version, Requires Android etc..) This will show proper data only when you push your game into a "Production". There is no info about that in play store help, I was told that by one of the guys from support. Oh and If you have some troubles with something just ask them (support). They answer very fast and can explain everything very nicely, even guide you step by step. They have the best costumer service I have ever encounter (excluding scirra team )